Concrete-mixer.



Efo. 320,928, PATENTBD MAY 15, 1906. H. W. HUBBARD. GQNGRBTE MIXER.'

APPLIUATIUN FILED JUNE 20.1904.

2 SHBETS-SHBET l.

WTNESSES.-

Y /N'VENZOR A from/'E yg No. 820,928. PATENTBD MAY l5, 1906. E. W. HUBBARD.

CONCRETE MIXER.

A PPLI'ATON FILED JUNE 20. 1904.

2 SHEETS--SHBET 2.

` IN1/EN Tof? no. aaneen.

ipecication of Letters Itatent.

Patented May 155, 1906,

Application tiled June 20,1904. Serial No. 213,205.

vide nriano for thoroughly mining' the ingre diente: lor the prianiration ol concrete ioilan;T of the usual purposes. A y Another olneet oli thus invention it to pro;

vide euch a infjchanisni that will operate eontinuonsly, receiving a constantnuppl)7 oil inaterials and discharging steadily the completed homogeneous mi2; ture thereof. 4

Another object oi this invention is to provide a oontinuouolympointing conerotennixer with a novel means for introducing water to the material at an interniediatix 'portion ol' the machine, such means being protected from the action oi the said material.

Another object et this invention to accomplish theahove result h v the employment oi' a pair oi conical drums, one projecting Within the other, so as to provide a opace hetween them to contain the water-injecting means. A

Anotherohject of this invention is to equalize the pressure upon the supporting-frame by employingr a pair of inixng-drun1s rota t ingr in o posite directions.

Anot ier object ol this invention is to provide for adjustahly deterniiningl the speed ol' travel oi the material through a 1nixer-drum with relation to the speed ot rotation ol' the drum.

With the alyove and other ohjeets in View the in vention consists in the devices and parte and their equivalents, as heroinal'terfset fort-l1.

Referring to the aocoin ianying drawings, in which like characters o reference ind ieate the saine parte in the several vieWS, Figure 1 is a vertieal longitudinal sectional view oi a rainereteaniner embodying; this invention. Figi. 2 is an end elevation oi the lower drum. thereof looking-- in the direction of the axis oi Said drinn. liliir. L", is a diagram Showing" the nourrie et thevnaterials through the drum. Fig. i is a plan view oi a aupportinbdraine "in pairs arraiwed in alinement.

somewhat similar to that shown in Fig. 1, but slightly niodiiied therefrom; and Fig 5 is an end elevation of the two drums as shown in Figa l looking in a horizontal direction and Vshowing` the lower drum sectioned on the line 5 oir Fig. 1 and illustrating the notion of the drunnhladee upon the material.

in thea@ drawings, 8 represents an inclined supitilting-frame whieh is preferably rectangul: and constructed of channel-iron sides and li-heain cross-rails, as Shown. The supporting-heme is mounted on Wheels 9 to eonstitute a vehicle in the usual manner., the iront wheels heini: omitted in the' illustration.

Suitable journal-hoxes 1.() are arranged on the crossdieams oi the frame near each side thereof, and journaled in them. are shafts 1 1 Frietionroller@` 12 are 'lured on the shafts 11 at each end thereof and tit against the hearings 1() to i'orin thrust-hearings for the shafts 11.

A metal drum 1.3, formed of a hollow shell .shaped like a trunoated cone, is mounted on the friction-rollers 12 ol the upper pair of shafts 11 hy having' securely fastened Within its larger end a slightljreduced `1nouthring 141, which has a shouldered annular track l5 hearing on the upper irietionerollers of the upper pair oi shafts 11,and a collar 16, rigidly secured to the exterior of the shell near its smaller end, is provided with an annular l'langed rail 1T bearing upon the lower 'l'riotion-rollers 12 oi the upper pair of shafts 11.

A correapondingly-shaped drinn 13 is sinne larly mounted upon the triet-ion-rollers 12 oi` the lower pair olehafts '11 and is identical in construction with the mixingdrum 13, with the exception that it .is provided at its smaller or discharge end with a ilaringir rim 1,8. The lower drum 13 is so positioned that its mouth-ring 14 surrounds the smaller end of the upper drum ior a short distance, leaving; an intervei'iinggn space 19. I 4 Within the space 19 between the overlap ping endiroi the-two drums proj eets a Water-- supply 4pipe 20, having an are-shaped perloratedepray-nozzle 21 following said. s ace 19 to the bottom of drain 13, where itin provided with a Ydrairnplug; 22, threaded in its end. ,i

Each. oi the mouth-rings 14 and 14 is p1`o vided With an annular series 'tgear-teetn 23 and 23 respectively, and a horizontal shaft 24, which is journaled lengthwiseof the frame in suitable bea-rings 25, supported by the crossbeams of the frame, carries at its rear end,a beveled pinion 26 to mesh with the gear-teeth 23 of the ldrum lll/,and also car'- ries a pinion 27 at its intermediate portiontoA mesh with an -idle pinion 28, journaled on a stud 34, which is carried by al bearing 25 1o above the shaft 24 and which idle pinion in turn meshes with the gear-teeth 23 of the drum 13. `The shaft 2l is driven by any suitable source of power (not shown) and by means of the pinions 26 Vand 27 rotates the r 5 mixing-drums, and by reason of the idle pinion 28 being interposed between the pinion 27 and the gear-teeth 23 of the drum 13 said drum will be caused to rotate in the opposite direction to the direction of rotation given to zo druin 13', as indicated by the arrows in Figs.

1 and 5.

Each of the mixing-drums is'provided in .the interior of its shell with longitudinal radial metal blades 29, which serve to lift the material contained within the Inixing-dru1`ns during the rotation of said drums and carry it until the incline of said blades, due to their rotary motion, drops the material to other blades beneath or t'o the bottom of they drum, 3o as clearl f shcvm in Fig. 5, and therebyeffects a t orough mixing of the several ingredients which are to constitute the concrete.

The material is fed to the upper drum through a hopper`30, which discharges into 3 5 an inclined chute 31, entering the mouth of the upper drum, so that as the hopper is supplied with the dry ingredients they will pass y way of chute 31 into the drum 13 and there be thoroughly mixed bv the lifting and 4o dropping operation of the blades 29, and as the dry mixture falls from the smaller end of the upper drum-13 into the larger 4end of the lower drum 13 it has water sprayed into it from the nozzle 21, which being between the overlapping ends of the two .drums is protected from-contact with the falling material. The operation ofthe lower drum 13 is to thoroughly mix the water with the drymixture received from the upper drum.

lt is desirable that the lower edge of each mixing-drum should be perfectly horizontal, shown in Fig. 1, and the incline of the frame 8 is designed to roduce this effect when the wheels thereof) rest upon a hori- 5 5 zontal surface. The lower edge of a conical drum being horizontal, its axis is necessarily on an incline and the circle of rotation of any point of the drum is in an inclined laneat right angles thereto. The materia falling 6o from the chute 31 into the bottom of the drum is carried upward by the blades for a distance, moving in an inclined plane atlright angles to the axis of the drum until it drops from the blades owing to the inclination of said blades, and fallingy in a vertical lineit eadeae strikes the bottom of the drum at a point in advance of its startin -point, and this action is continued re ated y, as indicated by the line y in the iagram of Fig. 3, until it is finally moved step by step throughout the length of the drum and is discharged at the smaller end thereof. As a matter of fact the dropping of the material from the blades is not in the vertical line; but by reason of the longitudinal inclination of the blades at the time -the material slides therefrom it is given a forward startas it rolls across the blades to make it take a downward course inclined in the direction of the feed, and therefore adds to the progress of the feed.

Should it be found that in a particular instance the feed of the material through the' drums is too rapid for a perfect admixture thereof, the said drums are to be adjusted so as to diminish the inclination of their axes by any lsuitable means, such as by forcing wedge-blocks 32 beneath the rear-wheels of4 the machine. Thus by making the axes of the drums nearer horizontal the planes of the lift of the material, which are at right angles to the axes, become nearer vertical, and consequently the itch ofthe feed of said material is diminis ed and the time during which the material is retained within the drums is increased, so that a greater mixing action is obtained to overcome such deficiency.

lt is obvious from the above that an increased speed of feed may beaccomplished by altering the inclination of the machine in the opposite direction by the use of the wedgeblocks 32 or in any other desirable manner. n

It will be. observed that the treads of track-ring 16 and the traclr 15 are of the same diameter, and consequently receive an even frictionless bearing on the pairs of Cqualsized frictionerollers 12 on the parallel shafts 11, and the flange of the track-ring 16 and theshoulder of thetrack 15 by engaging the rims of said friction-rollers serve as thrust-bearings to prevent longitudinal dis-v ICO IIO

lacement of the drum. Should it be found,

owever, that additional provision is nnec` essary to prevent the thrust of the drums, frictiOn-rOlls 33 may be provided with support from the cross-beams of the frame 8, as seen in Fig. 4, the track-rings,

The open end of the lower drum serves as a convenient means for viewing the mixing operation, so that an attendant may contro the supply of water to suit the requirements of the condition of the mixture.

lt is to be noted that aside from the provision of the conveniert space 19 for the housing of the water-feed pipe thelirrangement of the communicating pair. of drums further enables the Weight or the Vin 'achille to be equally distributed on the tjvosrdes of the to Abear against the flanges of amas@ niixers, it is obvious that the novel principles` involved are eiliiall applicable to machiites for other purposes, aa in driera and in other classes oi mixers, and therefore it is to be understood that such embodiments ol' the driveshaft, and a third pinion suitably these principles are to be included within the scope ol my invention.

Jin important feature ol this invention is that all of the blades of each mixing-drum are perfectly straight throughout and lie in axial planes which facilitates the manufaeture of the machine and rendersi it compara iivelvY easy of cleaning.

What i claim as mv invention is i. 1n a, device of the character described a niixing-drn1n comprising, a conical shell. a

mouth-ringr having a shouldered track with a serien` oi gear-teeth, parallel shafts j0urnaled in the trame, triction-rollers mounted on the parallel shams and bearine' on the tread and rail of the traclering and mouthring respectively of each mixingdrum, a. drive-shaft liournaled in the fraine,"a pinion on the drive-shaft meahine,r with the gearteeth ol the lower drinn, a second pinion on iournalcd in the frameand meshing` with the second pinion and the gear-teeth of the'upper mixingalriim.

4. 1n a device of the character described, a pair of conical drums arranged on the same inclined axis with the smaller end of one d'i; pg'qjilggtgpg ui'lliin illi llvll'Lf'LI Clltl 0lI other drinn, and straight radial blades in the l drums adapted to mix traokring mounted on Athe 4exterior of the i Shell and provided with a reduced mouth-ringr secured to the larger end of the shell and provided with a' sliouldered track, a supportinit-frame, shafts joiirnaled in said frame, friet ers carried by the parallel 'shafts and receivine; the tread of the track 'rar and the track of the mouth-ring and bearingl upon the ilai'ige of the track-ring and the the moiith-ring, and iiieana i'or rotating; the drinn.

2. In a device oi the character described a mixing-drinn comprisingr a conical shell, a track-ring mounted on the exterior ol the ahell and provided with a flanged tread, a

parallel ion-ri illf flanged tread, a

material and feed it degrees by lifting the through the drums by and dropping niaterial carryingy it forwardly it in an advanced poaition,

AIn a device of the character described, an inclined l'raine, :i pair of conical drums rotatahliY mounted thereon with one drinn havincr ita smaller end projecting within the il larger end oi the other drum,` meant,` mount shoulder ol' `reduced moutlering secured to the largerl end of the shell and provided with a shouldered track,y a supporting-frame, parallel shafts jouri'iiiled in said frame, lrictiiin-rolhl ers carried by the parallel shafts and re ceivinrr the tread of the trat-.lering and the i trackoll the inoutleriiig and bearing upon the ilange of the trank-ring and the shoulder of ,E

drums,` for mixing material `rotatahliv mounted thereon ed on :said frame for rotating the drums in o )posite directions, and stra-ight radial blades in the drums adapted to mix material therein and l'eed itthi'ough the drums by lifting the material and droppii'igl,r it, in an advanced position, the material being given a forward atart b v the inclination'of the blades when it drops therefrom.

ti. ln ii device ol' the character described, an inclined frame, a pair of conical drums arranged with. their aan,l on an incline and the smaller end oi' one drinn iroji-cting within the larger end ol thcotlicr drinn with a space therebetween, means for rotating the trams, water-intro dui-ini; means in said space between the ial blades in the therein and feedine; it therethrough by degrees, said blades lifting1 the material and dropping it in an addruma, and atraight rai vanccd position.

In testimony whereof ll allix my signature in presence bl two witnesses.

l-I. WllLBElt HUBBARD.

lilitnesses li.. S. C. CALDWELL, ANNA l?. Seiniim'riaiiuim. 

